Lubricating device



5 having two spaced apart sets of packing rings, section, the lubricating device according-to the 5 Patented July18,1939 I 2 1 357- UNITED STATES PATENT OFFICE a W .iil'ifi fihfffi...

Application October-3, 1935, Serial No. 43,430

In Francc ootobcr 6, 1934 7 Claims. (Cl. 309-8) Thepresent invention concerns a lubricating tion will be hereinafter described, with reference device applicable to pistons reciprocable in ento the accompanying drawing. given merely by gine cylinders. This device is more especially up way of example, andin which: plicable to pistons of great length or to pistons Fig. 1 shows, on a large scale and in vertical one at each end because, in this case, the middle invention. as pp 2 a Piston including grooves part is liable to be insufficiently lubricated. In associated with a leakage collector. order to facilitate the description of the inven- Fig. 2 shows in elevation view on a smaller tion, it will be supposed that the piston moves in scale, a piston similar to that shown on Fig. l, 10 a vertical direction. I a the cylinder in which said piston works and the The lubricating device according to the presleakage collector. ent invention is of the type in which the flow of Figs. 3 and 4 illustrate two modifications of lubricant to the parts to be lubricated is prothe arrangement shown on Fig. 1. duced by the effect of inertia. Referring to Figs. 1 and 2 wherein like refer- Aocording to the invention, the lubricating deence characters denote like parts, cylinder I is vice, which is associated with the piston. includes provided with a collector 8 intended to permit the channels or pipes interposed between oil grooves evacuation of the gases and liquids that have or channels provided in the piston and an auxilleaked past the upper packing rings (not shown iary reservoir of lubricant associated with the in the drawing) of the piston Lllbrication 0 piston, the device being provided with check said 'piston 3 is ensured through oil grooves or 20 valves or the like which impose a unidirectional channels such as It. At I6 there is provided an flow of the lubricant driven by the eflects of annular groove through which the leakage gases inertia, in the course of the reciprocating moveand liquids are led to collector 8. Groove l6 comments of the piston. municates through one or several oblique grooves In an embodiment of the invention, the auxil- 25 (Fig. 2), with a peripheral groove '23 provided 25 iary reservoir consists merely of a peripheral at the upper part of the piston but below the groove provided in the piston and collecting, upper packing rings. through one of its edges, the excess of oil driven Below packing rings Hi, there is provided a by the packing rings ofthe lower-part of the groove 20 for the accumulation of oil, in which is piston or by the lower edge of said piston. collected, in the course of the downward stroke 30 Alubricating device as above set forth may adof piston 3, the oil scraped by the lowermost vantageouslybe used incombination with a pispacking ring. This groove 20 communicates, tonhaving a set ofpacking rings at either end through a conduit 2|,provided with acheck valve thereof and, between these two sets of packing or equivalent member, such as a ball 22, with the rings, two annular grooves connected together lubrication groove or oil channel I8. When pis- 35 by longitudinal grooves, thesewarious grooves ton 3 moves in the downward direction, the oil I serving to convey toward a leakage collector the present in groove 20 and the oil that has already gases that ha e leaked past the packing rings. entered passage II are urged in an upward direc- In thiscase, the auxiliary reservoir is located at tion, with respect to the piston, by the effect of 40 the lower part and is capable of collect ng oil beinertia, so that the oil scraped by packing rings 40 low the lowermost packing ring. As a modiflca- II is thus used for lubricating the central portion tion, or in combination with the above described oi ,thepistom. arrangement. or again independently thereof, the The oiLdeposited upon the inner wall of cylreservoir may be arran ed in such maner as to inder I during the upward stroke of :the piston is 47, receive from caves providedat the lower end of thus utilized nearly entirely for lubricating most 5 .the piston the ol that drips along the innerwall of the friction surface of the piston The small of the latter. The oil driveninto the lubricating amount of oil that has beenable to leak past the grooves can. after having performed its function,- packing rings can be evacuated through col-' be removed through the leakage collector where lector 8 and be recovered. it can easi y be separated. from the gases and Of course, ball 22 might be replaced by any 1, then recovered. ,1 equivalent member such as a pin valve or a Other features of the present inventi n will reneedle valve having a fixed or adjustable stroke. suit from the following detailed descript on of As shown by Fig. 2, the lubricating device above specific embodiments thereof. described is advantageously used in combination A preferred embodiment of the present invenwith a piston having a set of packing rings at 55 V either end thereof and, between the two sets of packing rings, two annular grooves 23 and I6 con- 2| provided with a check valve 22 extends from' the oil reservoir to lubricating groove l8.

In the modification of Fig. 4 which amounts to -a combination of the embodiments shown on Figs.

1 and 3, I still use a reservoir 29 adapted to receive oil from eaves 21, while it is also arranged to receive oil collected at 20 below the lowermost packing ring.

What I claim is;

1. The combination, with a piston having an auxiliary reservoir of lubricant, lubricating groove in its external surface spaced apart from said auxiliary reservoir, and a connecting passage from said auxiliary reservoir to said lubricating groove; of check means movable in said passage,

responsive to inertia for closing the passage to prevent back now of lubricant from the lubricating groove into the auxiliary reservoir, also responsive to inertia for opening the passage, to permit transfer of lubricant from the reservoir to the groove. I i

2. The combination, with a piston having a peripheral groove in its external surface adapted to collect lubricant, a lubricating groove in its external surface spaced apart from the lubricant collecting groove and a passage extending from said lubricant collecting groove to saidlubricating groove for conveying lubricant from the former to the latter; of check means. movable in said passage, responsive to inertia for closing the passage to prevent back flow of lubricant from the lubricating groove into the auxiliary reservoir, also responsive to inertia for opening the passage to permit transfer of lubricant from the reservoir to the groove. i

3. In combination, a cylinder; 8. piston adapted to reciprocate in said cylinder along the inner wall thereof, said piston having in its external surface a lubricant collecting recess and a lubrieating groove spaced apart from the recess, which recess has an edge adapted to scrape lubricant from said cylinder inner wall for collection in said recess, the piston being fu'rtherlprovided with a passage between the recess and the groove for conveying lubricant from the former to the latter; and inertiaresponsive means movable in said passage for imposing a unidirectional flow of lubricant therein, from saidrecess to said groove.

4. In-combination, a piston having an open top lubricant-collecting reservoir at the bottom part of the skirt, eaves arranged on the internal wall of said skirt in overhanging'relation above said reservoir for leading thereto lubricant dripping along said internal wall, a lubricating groove in the external wall of said skirt and a lubricant transfer passage between said reservoir and said lubricating groove; and valve means movable in said passage, responsive to inertia for closingthe passage to prevent back flow of lubricant from the lubricating groove into the reservoir, also responsive to inertia for opening the passage to permit transfer of lubricant from the reservoir. to the groove.

5. In'combination; a cylinder; a piston adapted to reciprocate in said cylinder along the inner -,wall thereof, having a head and a body portion,

said body portion being provided in a zone remote from said head with a lubricant collecting recess in sunken relief on its external surface and, in a zone intermediate said head and said recess, a lubricating groove also in sunken relief on its external surface, said body portion further including an inner communication passage directed substantially parallel with the piston axis, from said recess to the lubricating grooves; means associated with" said piston, peripherally disposed between said recess and said groove, and movable with the piston for providing a seal between said piston and said cylinder; and valve means responsive to inertia, movably arranged in said passage for sealing the same to prevent transfer of lubricant from said groove to said recess while allowing transfer-from the recess to the groove.

6. .In combination, a substantially vertical cylinder having in its internal wall hollow means for discharging leak gas out of said cylinder: 2. piston adaptedto reciprocate in said cylinder, having leak gas collecting grooves in the middle portion of its external surface adapted to cooperate with the hollow means, said piston being further provided with a bottom'lubricant reservoir, a lubricating groove in the middle portion of its external surface spaced apart from the leak cating groove above said bottom groove at a distance therefrom, of check means movably disposed in said passage and responsive to inertia for closing the passage to prevent downward movement oflubricant therein, also responsive to inertia for opening the passage to permit upward movement of lubricant therein.

- JEAN BUGATTI. 

